lib/lxc-container: disable DHCP globablly

It is still configured for eth0.

lib/lxc-container.nix

@@ -9,7 +9,7 @@
   nix.useSandbox = false;
   nix.maxJobs = lib.mkDefault 1;
   nix.buildCores = lib.mkDefault 4;
-  #networking.useNetworkd = true;
+  networking.useDHCP = false;
 
   networking.interfaces.eth0 = {
     useDHCP = true;
@@ -24,7 +24,7 @@
 
   # Create a few files early before packing tarball for Proxmox
   # architecture/OS detection.
-  system.extraSystemBuilderCmds = 
+  system.extraSystemBuilderCmds =
       ''
           mkdir -m 0755 -p $out/bin
           ln -s ${pkgs.bash}/bin/bash $out/bin/sh